Query #1: SELECT, variables, and a triple pattern

In the graph http://www.w3.org/People/Berners-Lee/card, find me all subjects (?person) and objects (?name) linked with the foaf:name predicate. Then return all the values of ?name. In other words, find all names mentioned in Tim Berners-Lee's FOAF file.

Projected expressions. All variable bindings in a SPARQL/Query 1.0 query must come from data matched in the underlying dataset graphs. Projected expressions allow for query results to contain constants, functions, or any other expression.

Subqueries. Several current SPARQL implementations support subqueries, allowing one query to be embedded within another.

What's new in SPARQL 2? (cont'd)

Time permitting, the SPARQL WG will also pursue:

SPARQL with other entailment regimes. How does SPARQL interact with OWL, RDF Scehma, or RIF?

Property paths. SPARQL query patterns are fixed length structures. This makes it difficult to query hierarchical/recursive data structures such as lists or trees. There are several approaches to extending SPARQL to deal with this.

Basic federated query. How can a single query be split among multiple SPARQL endpoints and the results from each combined together?

Dataset: Linking Open Data Warehouse

OpenLink Software hosts an RDF data warehouse with billions of triples from the Linked Data Cloud

This includes 28 million FOAF individuals, many of whom derive from FOAF data published by LiveJournal

Among other information, RDF from LiveJournal includes people's interests...

Query #14: SPARQL extension: aggregates

What are the top interests of LiveJournal users interested in Harry Potter?